484 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
nates; crenulations of the inner border variable in size, somewhat clustered; pallial sinus very small, 
angular; interior white or often violet, with a light border. 
Length, 38; height, 30; diameter, 25 mm. 
Puerto Real; Mayaguez; San Juan; Boqueron Bay, Porto Rico; Vieques. 
Venus granulata Gmelin. 
Venus granulata Gmelin, Syst. Nat., p. 3277, 1792; Reeve, Conch. Icon., xiv, pi. xvi, fig. 62, 1863. 
Shell rounded to subtriangular, inflated, solid, with a distinct lunule and a narrow posterior 
excavation; surface covered with radiating ribs which are crossed by concentric ridges, forming rather 
sharp nodules on the ribs. Color ashy, variously marked with brown, dotted, blotched, or sometimes 
in angular or chevron-shaped patterns, sometimes in irregular bands; rarely nearly the whole shell is 
brown. In the left valve the central cardinal is slightly bifid; in the right the two anterior ones are 
somewhat divided; interior variously marked with violet and white; border crenulations minute. 
Length, 26; height, 23; diameter, 17 nun. 
San Antonio Bridge, San Juan, Porto Rico, one specimen. 
Venus latilirata Conrad. 
Venus latilirata Conrad, Proc. Acad. Nat. Sci. Phila., i, p. 28, 1841. 
Venus varicosa Sowerby, Thes. Conch, ii, p. 723, pi. clv, fig. 67, 1853. 
Shell subtriangular, solid, inflated, with high umbonal region, though the beaks are rather 
compressed; lunule large; surface sculptured with nine or ten very strong, wide, concentric ridges; 
these are rounded and have a deep canal at their upper bases. Color dirty white or buff, with faint, 
various-sized pale-brown radiations; teeth entire; beak cavities deep; pallial sinus very small; border 
crenulations tine; interior white, with salmon or red tinting in the beak cavities. 
Length, 33; height, 29; diameter, 22 mm. 
Mayaguez, Porto Rico, dead young valves, possibly of this species. 
Venus paphia Linnaeus. 
Venus paphia Linneeus, Syst. Nat., ed. XII, p. 1129, 1767; Reeve, Conch. Icon., xiv, pi. xix, fig. 89,1863. 
Shell triangular, inflated, solid, with a well-developed posterior ridge in each valve, the area 
behind the ridges wide and shallow; lunule depressed so that the outline of that part of the shell 
inclosing it is incurved; surface covered with strong concentric ribs which are furrowed at the upper 
side and are nearly smooth over the anterior three-fourths of the shell; behind this and extending to 
the posterior area the ridges are lamellar. Color ashy or dirty white, variously marked with brown, 
the markings having a tendency to radiation, and they are often somewhat chevron-shaped. There 
are generally three more or less distinct dark radial bands; cardinals entire; pallial sinus very small. 
Length, 45; height, 37; diameter, 26 mm. 
Mayaguez, Porto Rico, one young specimen; Vieques, a number of beautiful examples. 
This well-known species is near to the much rarer V. latilirata. The latter is smaller and has 
much heavier, wider ribs, which do not break into laminae at their posterior ends. 
Venus pyg-maea Lamarck. 
Venus pygmxa Lamarck, An. sans Vert., v, p. 585, 1818; Reeve, Conch. Icon., xiv, pi. xxvi, figs. 138 a-c, 1864. 
Quebradillas, Porto Rico (Gundlach). 
Subgenus Anomalocardia Schumacher, 1817. 
Venus flexuosa Linnaeus. 
Venus flexuosa Linmeus, Syst. Nat.,ed. xii, p. 1131,1767. 
Venus macrodon Reeve, Conch. Icon., xiv, pi. xxi, figs. 98 b-d, 1863. 
Shell triangular, inflated, solid, with a high posterior ridge, which is almost pinched up in the 
earlier stages of growth, but which fades out near the base in the adult state; posterior end truncated, 
lunule large and shallow; surface more or less covered with strong, irregular, concentric ridges, which 
are often divaricate just in front of the posterior ridge, and having tine, radial sculpture above; the 
region toward the posterior base is always smooth. Color bluish or ashy white, variously marked 
with brownish or lead color; pallial sinus small and angular; crenulations on the inner border strong. 
Length, 33; height, 28; diameter, 20 mm. 
Mayaguez; Puerto Real, Porto Rico, worn valves. 
